Cathode ray tube apparatus intended to reduce magnetic fluxes le

Details Cathode ray tube apparatus intended to reduce magnetic fluxes le Cathode ray tube apparatus intended to reduce magnetic fluxes le

1992-05-26

1993-02-23

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, 335210, G09G 104, H01J 2906

Patent

active

051893487

ABSTRACT:
In a cathode ray tube apparatus, a deflection yoke for generating an effective magnetic field to deflect electron beams in an envelope is provided around a funnel of the envelope. A pair of front magnetic coils are in substantially symmetrical with respect to a horizontal plane including a tube axis and a horizontal direction and are provided on a skirt of the envelope. A pair of rear magnetic coils are also arranged in substantially symmetrical with respect to the horizontal plane and are provided on the deflection yoke. Leakage magnetic fluxes generated from the deflection yoke are reduced by compensating magnetic fluxes generated from the front and rear magnetic coils.

REFERENCES:
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patent: 4851737 (1989-07-01), Johansson et al.
patent: 4857805 (1989-08-01), Bosch et al.
patent: 4922167 (1990-05-01), Sluyterman et al.
IBM Technical Disclosure, vol. 30, No. 12, May 1988 "Cancellation of Leaked Magnetic Flux".
Patent Abstracts of Japan, Unexamined Applications, Sep. 12, 1987 E. Field, vol. 11, No. 284, p. 95 E 540 Kokai-No. 62-82 632 (Mitsubishi Electric).
Patent Abstracts of Japan, Unexamined Applications, Jun. 25, 1988, E. Field, vol. 12, No. 225, p. 165 E 626 Kokai-No. 63-19 740 (Denki Onkyo).
IBM Technical Disclosure Bulletin, vol. 30, No. 12, May 1988, New York U.S. "Cancellation of Leaked Magnetic Flux", pp. 9-10.
MPR, Series MPS 1988, Guide to the Evaluation of Reports on the Testing of Visual Display Terminals.

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